Malicious PDF — malware analysis report

Static analysis result for SHA-256 acc3aaec24b4c041…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 14:06:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 16788e658b3c7ea1702584fb3ba903b5 SHA-1: 40d4d320c3ab8bf6333ac85241d6b6cd9f3d3acd SHA-256: acc3aaec24b4c041265b9d6cbeb1f7e19586ea9c7557c5490ca864b71f0b8fc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that function as a link farm, directing users to potentially malicious websites. Heuristics indicate these links are hosted on compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://pixomot.ru/uplcv?utm_term=vidmate+previous+version PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc59d4cc29---3408375502.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/67044212542.pdfIn PDF document text
    • http://winso.tw/userfiles/file/4838220549.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/70551996211.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/71230578131.pdfIn PDF document text
    • http://hueide.com/upload/files/50632049692.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/rogex.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/74016596406.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/36585594161.pdfIn PDF document text
    • http://efrex.cz/files/file/46143913599.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/35560642966.pdfIn PDF document text
    • http://globomax.eu/userfiles/file/65206860351.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16143691635f41---80090369784.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/20579770819.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210901085445.pdfIn PDF document text
    • http://abnicum.com/files/file/55964008076.pdfIn PDF document text
    • http://saimiri.name/upload/file/5212417012.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/94359853633.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/45470757311.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/zukolidajesuzuvujadopimo.pdfIn PDF document text
    • https://marbeyoyun.com/calisma2/files/uploads/gatogameruzofexa.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910054909.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451315ec874---limidekelute.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/vugibuzubisuta.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/025cd079b92a421df77ce682356bebd2/38742648162.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/gijelazese.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 10644 bytes
SHA-256: d77f9667c14991768f865d77696c19fffc5a85fa1e34787daabdf34f70e6281e
font_01_sfnt_off0000e2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E3 16632 bytes
SHA-256: 4ae4f94fea185524bc7cca9ef2453f9c1665cb197af9783daf87bbc0ed74dce9
font_02_sfnt_off00010de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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